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Galas A, Krzesiński P, Gielerak G, Piechota W, Uziębło-Życzkowska B, Stańczyk A, Piotrowicz K, Banak M. Complex assessment of patients with decompensated heart failure: The clinical value of impedance cardiography and N-terminal pro-brain natriuretic peptide. Heart Lung 2018; 48:294-301. [PMID: 30391076 DOI: 10.1016/j.hrtlng.2018.10.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/30/2018] [Accepted: 10/01/2018] [Indexed: 12/28/2022]
Abstract
BACKGROUND Acute decompensated heart failure (ADHF) is a serious clinical problem and a condition requiring immediate diagnostics, supporting the therapeutic decision adequate to the specific ADHF mechanism. N-terminal pro-brain natriuretic peptide (NT-proBNP) is an established biochemical marker of heart failure, strongly related to hemodynamic status. Impedance cardiography (ICG) provides non-invasive hemodynamic assessment that can be performed immediately at the bedside and revealed to be useful diagnostic tool in some clinical settings in cardiology. OBJECTIVES The aim of this study was to evaluate the usefulness of ICG in the admission diagnostics and monitoring the effects of treatment in patients hospitalized due to ADHF, with special emphasis on its relation to NT-proBNP. METHODS This study enrolled 102 patients, aged over 18 years, hospitalized due to ADHF. The subjects underwent detailed clinical assessment, including ICG and NT-proBNP at admission and at discharge day. RESULTS Among all analyzed ICG parameters thoracic fluid content (TFC), a marker of chest overload, was the most significantly correlated with NT-proBNP level (R = 0.46; p = 0.000001). In comparison with patients with low thoracic fluid content (TFC ≤ 35/kΩ), those with higher TFC values (>35/kΩ) exhibited a greater severity of symptoms (NYHA functional class); higher NT-proBNP levels; lower left ventricular ejection fraction (LVEF), stroke index (SI), and cardiac index (CI); as well as significantly higher systemic vascular resistance index (SVRI). These TFC-based subgroups showed no significant differences in terms of heart rate (HR), systolic blood pressure (SBP), or diastolic blood pressure (DBP). CONCLUSIONS The evaluation of hemodynamic parameters, especially TFC, seems to be a worthwhile addition to standard diagnostics, both at the stage of hospital admission and while monitoring the effects of treatment. Impedance cardiography is a useful method in evaluating individual hemodynamic profiles in patients with ADHF.
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Affiliation(s)
- Agata Galas
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland.
| | - Paweł Krzesiński
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
| | - Grzegorz Gielerak
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
| | - Wiesław Piechota
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
| | - Beata Uziębło-Życzkowska
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
| | - Adam Stańczyk
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
| | - Katarzyna Piotrowicz
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
| | - Małgorzata Banak
- Department of Cardiology and Internal Diseases, Military Institute of Medicine, ul. Szaserów 128, 04-141 Warszawa, Poland
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Webb DJ, Coll B, Heerspink HJL, Andress D, Pritchett Y, Brennan JJ, Houser M, Correa-Rotter R, Kohan D, Makino H, Perkovic V, Remuzzi G, Tobe SW, Toto R, Busch R, Pergola P, Parving HH, de Zeeuw D. Longitudinal Assessment of the Effect of Atrasentan on Thoracic Bioimpedance in Diabetic Nephropathy: A Randomized, Double-Blind, Placebo-Controlled Trial. Drugs R D 2018; 17:441-448. [PMID: 28831752 PMCID: PMC5629141 DOI: 10.1007/s40268-017-0201-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background Fluid retention is a common adverse event in patients who receive endothelin (ET) receptor antagonist therapy, including the highly selective ETA receptor antagonist, atrasentan. Objective We performed longitudinal assessments of thoracic bioimpedance in patients with type 2 diabetes mellitus and nephropathy to determine whether a decrease in bioimpedance accurately reflected fluid retention during treatment with atrasentan. Study Design We conducted a randomized, double-blind, placebo-controlled study in 48 patients with type 2 diabetes mellitus and nephropathy who were receiving stable doses of renin angiotensin system inhibitors and diuretics. Methods Patients were randomized 1:1:1 to placebo, atrasentan 0.5 mg, or atrasentan 1.25 mg once daily for 8 weeks. Thoracic bioimpedance, vital signs, clinical exams, and serologies were taken at weeks 1, 2, 4, 6, and 8, with the exception of serum hemoglobin, which was not taken at week 1, and serum brain natriuretic peptide, which was only taken at baseline, week 4, and week 8. Results Alterations in bioimpedance were more often present in those who received atrasentan than in those who received placebo, though overall differences were not statistically significant. Transient declines in thoracic bioimpedance during the first 2 weeks of atrasentan exposure occurred before or during peak increases in body weight and hemodilution (decreased serum hemoglobin). Conclusions We conclude that thoracic bioimpedance did not reflect changes in weight gain or edema with atrasentan treatment in this study. However, the sample size was small, and it may be of interest to explore the use of thoracic bioimpedance in a larger population to understand its potential clinical use in monitoring fluid retention in patients with chronic kidney disease who receive ET receptor antagonists.
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Affiliation(s)
- David J Webb
- Edinburgh Hypertension Excellence Centre, Clinical Pharmacology Unit, University of Edinburgh, E3.22, QMRI, 47 Little France Crescent, Edinburgh, EH16 4TJ, Scotland, UK.
| | | | - Hiddo J L Heerspink
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
| | | | | | | | | | - Ricardo Correa-Rotter
- National Medical Science and Nutrition Institute Salvador Zubiran, Mexico City, Mexico
| | - Donald Kohan
- University of Utah Health Sciences Center, Salt Lake City, UT, USA
| | - Hirofumi Makino
- Okayama University Graduate School of Medicine, Okayama, Japan
| | | | - Giuseppe Remuzzi
- Azienda Ospedaliera Papa Giovanni XXIII and IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Bergamo, Italy
| | | | - Robert Toto
- University of Texas Southwestern Medical Center, Dallas, TX, USA
| | | | | | | | - Dick de Zeeuw
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
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Muller PA, Mueller JL, Mellenthin M, Murthy R, Capps M, Wagner BD, Alsaker M, Deterding R, Sagel SD, Hoppe J. Evaluation of surrogate measures of pulmonary function derived from electrical impedance tomography data in children with cystic fibrosis. Physiol Meas 2018; 39:045008. [PMID: 29565263 DOI: 10.1088/1361-6579/aab8c4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Lung function monitoring by spirometry plays a critical role in the clinical care of pediatric cystic fibrosis (CF) patients, but many young children are unable to perform spirometry, and the outputs are often normal even in the presence of lung disease. Measures derived from electrical impedance tomography (EIT) images were studied for their utility as potential surrogates for spirometry in CF patients and to assess response to intravenous antibiotic treatment for acute pulmonary exacerbations (PEx) in a subset of patients. APPROACH EIT data were collected on 35 subjects (21 with CF, 14 healthy controls, 8 CF patients pre- and post-treatment for an acute PEx) ages 2 to 20 years during tidal breathing and also concurrently with spirometry on subjects over age 8. EIT-derived measures of FEV1, FVC, and FEV1/FVC were computed globally and regionally from dynamic EIT images. MAIN RESULTS Global EIT-derived FEV1/FVC showed good correlation with spirometry FEV1/FVC values (r = 0.54, p = 0.01), and were able to distinguish between the groups (p = 0.01). Lung heterogeneity was assessed through the spatial coefficient of variation (CV) of EIT difference images between key time points, and the CVs for EIT-derived FEV1 and FVC showed significant correlation with the CV for tidal breathing (r = 0.47, p = 0.01 and r = 0.50, p = 0.01, respectively). Global EIT-derived FEV1/FVC was better able to distinguish between groups than spirometry FEV1 (F-values 776.5 and 146.3, respectively, p < 0.01.) The same held true for the CVs for EIT-derived FEV1, FVC, and tidal breathing (F-values 215.93, 193.89, 204.57, respectively, p < 0.01). SIGNIFICANCE The strong correlation between the CVs for tidal breathing, FEV1, and FVC, and the statistically significant ability of CV for tidal breathing to distinguish between healthy subjects and CF patients, and between the studied CF disease states suggests that the CV may be useful for measuring the extent and severity of structural lung disease.
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Affiliation(s)
- Peter A Muller
- Department of Mathematics & Statistics, Villanova University, PA, United States of America. was at Department of Mathematics, Colorado State University, CO, United States of America
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4
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Subclinical pulmonary congestion is prevalent in nephrotic syndrome. Kidney Int 2017; 89:421-8. [PMID: 26444027 DOI: 10.1038/ki.2015.279] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/24/2015] [Accepted: 07/16/2015] [Indexed: 12/26/2022]
Abstract
In patients with nephrotic syndrome (NS), the lung is considered an organ protected from the risk of edema. However, data on objectively measured lung water in NS patients is lacking. Here we measured lung water by an ultrasound (US) technique as well as by transthoracic impedance in 42 asymptomatic patients with active NS, in 14 stage G5D CKD patients on chronic hemodialysis, and in 21 healthy individuals. In patients with active NS, the median number of US-B lines (a metric of lung water) after 5 min in a supine position was significantly higher (12; interquartile range: 7-25) compared with that in healthy individuals (4; 2-9) but similar to that in hemodialysis patients (23; 10-39). The difference between NS patients and healthy individuals was significantly amplified (16; 10-35 vs. 4; 2-9) after 60 min of supine resting and significantly attenuated after 5 min of standing (10; 7-25 vs. 3; 1-6). Posture-dependent changes in lung water in patients with active NS were significantly accentuated compared with both hemodialysis patients and healthy individuals. After NS remission, the number of US-B lines was significantly reduced to 5 (4-18) at 5 min and to 6 (5-22) at 60 min approaching the normal range. Lung congestion in patients with active NS was confirmed by transthoracic impedance. Thus, asymptomatic pulmonary congestion is pervasive in patients with NS. A clinical trial is needed to assess the utility of lung US for the management of patients with NS.
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Dodd M, Mueller JL. A Real-time D-bar Algorithm for 2-D Electrical Impedance Tomography Data. INVERSE PROBLEMS AND IMAGING (SPRINGFIELD, MO.) 2014; 8:1013-1031. [PMID: 25937856 PMCID: PMC4414053 DOI: 10.3934/ipi.2014.8.1013] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this paper is to show the feasibility of the D-bar method for real-time 2-D EIT reconstructions. A fast implementation of the D-bar method for reconstructing conductivity changes on a 2-D chest-shaped domain is described. Cross-sectional difference images from the chest of a healthy human subject are presented, demonstrating what can be achieved in real time. The images constitute the first D-bar images from EIT data on a human subject collected on a pairwise current injection system.
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Affiliation(s)
- Melody Dodd
- Department of Mathematics, Colorado State University, USA
| | - Jennifer L Mueller
- Department of Mathematics and School of Biomedical Engineering, Colorado State University, USA
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6
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Hamilton SJ, Mueller JL. Direct EIT reconstructions of complex admittivities on a chest-shaped domain in 2-D. IEEE TRANSACTIONS ON MEDICAL IMAGING 2013; 32:757-769. [PMID: 23314771 DOI: 10.1109/tmi.2012.2237389] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Electrical impedance tomography (EIT) is a medical imaging technique in which current is applied on electrodes on the surface of the body, the resulting voltage is measured, and an inverse problem is solved to recover the conductivity and/or permittivity in the interior. Images are then formed from the reconstructed conductivity and permittivity distributions. In the 2-D geometry, EIT is clinically useful for chest imaging. In this work, an implementation of a D-bar method for complex admittivities on a general 2-D domain is presented. In particular, reconstructions are computed on a chest-shaped domain for several realistic phantoms including a simulated pneumothorax, hyperinflation, and pleural effusion. The method demonstrates robustness in the presence of noise. Reconstructions from trigonometric and pairwise current injection patterns are included.
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Affiliation(s)
- Sarah J Hamilton
- Department of Mathematics, Colorado State University, Fort Collins, CO 80523, USA.
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Shoaib A, Mabote T, Zuhair M, Kassianides X, Cleland JGF. Acute heart failure (suspected or confirmed): Initial diagnosis and subsequent evaluation with traditional and novel technologies. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/wjcd.2013.33046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kataoka H. Novel monitoring method for the management of heart failure: combined measurement of body weight and bioimpedance index of body fat percentage. Future Cardiol 2009; 5:541-6. [DOI: 10.2217/fca.09.47] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Although body weight scales are most commonly used to evaluate body fluid status during follow-up of definite heart failure (HF) patients, bioimpedance measurement methods have become increasingly available in the clinical setting. These monitoring methods, however, are typically used separately to evaluate body fluid status in HF patients. Kataoka developed a novel method for monitoring HF patients using a digital weight scale that incorporated a bioelectrical impedance analyzer. This method combines the well-known advantages of body weighing with a refined bioimpedance technique to monitor HF status and provides valid information regarding a change in a patient’s body fluid status during follow-up for HF, such as predominant fluid versus fat weight gain or loss. This special report describes examples of the practical use of this method for monitoring and treating definite HF patients.
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Affiliation(s)
- Hajime Kataoka
- Division of Internal Medicine, Nishida Hospital, 3–3–24 Ohte-machi, Saiki-city, Oita 876–0831, Japan
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Arad M, Zlochiver S, Davidson T, Shovman O, Shoenfeld Y, Adunsky A, Abboud S. Estimating pulmonary congestion in elderly patients using bio-impedance technique: Correlation with clinical examination and X-ray results. Med Eng Phys 2009; 31:959-63. [DOI: 10.1016/j.medengphy.2009.05.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2008] [Revised: 03/12/2009] [Accepted: 05/19/2009] [Indexed: 11/27/2022]
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10
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Murphy EK, Mueller JL. Effect of domain shape modeling and measurement errors on the 2-D D-bar method for EIT. IEEE TRANSACTIONS ON MEDICAL IMAGING 2009; 28:1576-1584. [PMID: 19447702 DOI: 10.1109/tmi.2009.2021611] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The D-bar algorithm based on Nachman's 2-D global uniqueness proof for the inverse conductivity problem (Nachman, 1996) is implemented on a chest-shaped domain. The scattering transform is computed on this chest-shaped domain using trigonometric and adjacent current patterns and the complete electrode model for the forward problem is computed with the finite element method in order to obtain simulated voltage measurements. The robustness and effectiveness of the method is demonstrated on a simulated chest with errors in input currents, output voltages, electrode placement, and domain modeling.
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11
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Tang WHW, Tong W. Measuring impedance in congestive heart failure: current options and clinical applications. Am Heart J 2009; 157:402-11. [PMID: 19249408 PMCID: PMC3058607 DOI: 10.1016/j.ahj.2008.10.016] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Accepted: 10/07/2008] [Indexed: 02/07/2023]
Abstract
Measurement of impedance is becoming increasingly available in the clinical setting as a tool for assessing hemodynamics and volume status in patients with heart failure. The 2 major categories of impedance assessment are the band electrode method and the implanted device lead method. The exact sources of the impedance signal are complex and can be influenced by physiologic effects such as blood volume, fluid, and positioning. This article provides a critical review of our current understanding and promises of impedance measurements, the techniques that have evolved, as well as the evidence and limitations regarding their clinical applications in the setting of heart failure management.
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Affiliation(s)
- W H Wilson Tang
- Heart and Vascular Institute, Cleveland Clinic, OH 44195, USA.
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Radai MM, Arad M, Zlochiver S, Krief H, Engelman T, Abboud S. A Novel Telemedicine System for Monitoring Congestive Heart Failure Patients. ACTA ACUST UNITED AC 2008; 14:239-44. [DOI: 10.1111/j.1751-7133.2008.00004.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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